Percussion-drill



(up Model.) 3 sheets-sheet 2-.

LB. W. MEISSNER. l PERCUSSION DRILL- No. 551,595.1 --Patened D50. 11, 1595 /y 5mm,

(No Model.) y K 3 Sheets-Sheet l A. E. W. MEISSNER.

PERCUSSION DRILL.

- Patevntedbe. 17,Y 1895.

UNITED STATES" ADOLE EMIL VALDEMAR vMEISSNER, OF CHARLOTTENBURG, GERMANY, .AS SIGNOR TO THE SIEMENS it I-IALSKE ELECTRIC COMPANY OF AMERICA,

OE CHICAGO, ILLINOIS.

PERCUSSION-DRILL.

SPECIFICATION forming part of Letters Patent No. 551,594, dated December 17, 1895.

Application filed August 17, 1895. Serial No. 559,635. (No model.) Patented in Belgium March 15, 1894, No. 108,701; in Italy March 21, 1894, No. 35,821; in France May 4, 1894,11'0. 236,250; in Germany May 22, 1894,1To. 76,267; in South African Republic .Tune 19,1894,No.654; in England October 6,1894, No. 24,088; in Norway November 30, 1894,1To.

3,592, and in Sweden January 24,1895,No. 5,786.

To all whom it may concern:

Be it known that 1, ADoLr EMIL WALDE- MAR MEISSNER, a subject of the Emperor of Germany, residing at Charlottenburg, near Berlin, Germany, have invented new and useful Improvements in Percussion-Drills, (Case No. 619,) of which the following is a specification, and for which Letters Patent have been granted in Germany, No. 76,267, dated Io May 22, 1894; in France, No. 236,250, dated May4, 1894; in Great.Britain, No. 24,083, dated October 6, 1894; in Norway, No. 3,592, dated November 30, 1894; in Italy, No. 35,821, dated March 21, 1894; in Sweden, No. 5,786,

dated January 24, 1895; in Belgium, No.A

108,701, dated March 15, 1894, and in South African Republic, No. G54, dated .I une 19, 1894.

My invention relates to improvements in zo the method of and means for imparting motion to percussion-drills or similar reciprocating machines.

- In operating portable percussion-drills and similar portable percussion-inachines, it has 2 5 heretofore been found possible to produce the desired movement of reciprocation in the drill advantageously only by apparatus producing a direct reciprocating motion-as, for instance, compressed-air machines and electromagnetic solenoid machines.

It has not been found possible to use rotary power-machines, especially rotary electric motors, advantageously, without special appliances, for the following reasons: The

3 5 shock or recoil of the plunger renders impracticable the introduction of gear-wheels between the rotary machine and the plunger, even with the interposition of suitable springs such as are shown in Carl Hoifmanns United 4o States Patent No. 509,373, dated November 28, 1893. The power machine or motor must, therefore, be connected direct on the crankshaft or on a similar device needed for the production of the reciprocating motion, and,

hence, the power machine or motor must make as many revolutions as the tool must strike blows, and must therefore be a com paratively slow speed machine. A slowspeed machine, especially an electric motor, is one of low efficiency, and will therefore 5o have to be made comparatively heavy. The transportation of such machines, however,

'which are a combination of the machine itself and a heavy motor, would be in many cases exceedingly diflicult. In mines it would be simply impossible.

The employment of4 light motors-that is, of high-speed motors-would be possible only in the case that the rotating gears be not eX- posed to the injurious effects of the blow and 6o recoil. The transportation of such machines is still more facilitated if the motor is made an entirely independent part and the transmission of power is Y effected by a suitable liexible easily-connected medium; but even this can be' employed only if it is well protected against the injurious results of the blow and recoil.

The object of my invention is an arrangement which makes it possible both to employ 7o a high-speed motor and to separate this entirely from the working machine itself.

Referring to the drawings, Figure 1 is a perspective view of the machine as a whole. Figs.` 2 and 2a are side elevations of the drill- 7 5 ing-machine and the motor, the connection between them being shown broken; and Fig.

3 is a plan view, partly in section, of the same.

Like letters refer to like parts in the several figures. 8o

Power is transmitted from the electric motor a through the gear-wheels b t', at a reduced speed, to the flexible shaft c. This dexible shaft is connected by means of a coupling c', permitting of an easy and rapid connec- 85 tion and disconnection with the shaft of a bevel-wheel d, gearing with a bevel-wheel d', which carries a iiy-wheel d2.

The fly-wheel d2, which is solidly connected with the bevel-gear cl, is, by means of a key 9o and slot, mounted on a shaft e, which in turn imparts to the plunger j the necessary reciprocating motion by any well-known means, as by connecting-rods or p itmen, or by means of a crank and pin working in a transverse guide.

In the drawings a hand feeding device for feeding the plunger forward to its work is shown; but for the practical completion of this machine an automatic feeding device is intended, which will be the subjectmatter of a separate application for Letters Patent.

As it is necessary to use the drill at different heights and at different angles, an arrangement is provided, which permits of the drill being connected with the iiexible shaft without necessitating too sharp bends in the latter. For this purpose the gear d is mounted in the casing g, which can rotate around the box h, and which can be fastened in anypo sition thereupon by the set-screw g@ The box 7L also contains the bearing for the shaft c.

It has been found in practice that the weight of the fiy-whcel at the usual number of blows of percussion-drills and similar apparatus can be kept small for all practical purposes. Should, however, the total weight of the machine and fiy-wheel in certain cases be found too great for transportation, another arrangement, also illustrated in the drawings, can be made, by which the fly-wheel is easily detachable. For this purpose the fly-wheel is fastened on the wheel d by means of a pin (Z3 or in any other manner, thus taking the stress oif the nut d4. y

It will be seen that by the above-described arrangement itis possible to employ an electricmotor of the highest speed and therefore of the highest eliciency. The employment of such high-speed motor is rendered possible by the introduction of the reducing-gearing d d', and of the latter by the use of t-he flywheel, the accumulated energy of which is utilized for the forward blow. The loss of speed of the fly-wheel on account of this work is so little, and the lost energy is restored by ythe motor during the remainder of a whole revolution of the fiy-wheel so gradually, that an injurious recoil on the gear is prevented.

The iiexiblc shafting also to some extent performs, with regard to the reducing-gearing i) b', the same function that the fly-wheel performs with regard to the gearing l cZ-tl1atis, it absorbs any jar or recoil transmitted from the blow of the plunger-but its most important advantage is that it not only of itself follows the normal feed of the machine, but permits the plunger and casing to be moved about to follow the work quite independently of the motor, and the motor itself to be located in the most convenient place, as will be dictated by the conditions existing, for instance, in mines where the unevenness of the floor and the lack of space must be met with.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

l. In a reciprocating machine, the combination with a reciprocatingplunger, of a crank shaft for imparting movement to said plunger, a fiy wheel mounted directly upon said crank shaft, a high-speed electric rotary motor independent of the said reciprocating machine, and a flexible shaft connecting said motor with said crank shaft through suitable gears; substantially as described.

2. In a reciprocating machine, the combination with a reciprocating plungcr,of a crank shaft for imparting movement to `said plunger, a fiy wheel mounted directly upon said crank shaft, a high-speed electric rotary motor independent of the said reciprocating machine, a flexible shaft connecting said motor with said crank shaft, and suitable gears interposed between said m otor and said flexible shaft and between said flexible shaft and said crank shaft; substantially as and for the purpose set forth. p

In testimony whereof I have affixed my signature in the presence of two witnesses.

ADOLF EMIL WA'LDEMAR '.lllllSSNllli.

Witnesses:

JOHN B. JACKSON, OSCAR BIELEFELD. 

